Valve for steam-engines



UNITED STATES PATENT OFFICE.

GEO. YV. VAN DEREN, OF BIGFLATS, NEW YORK.

VALVE FOR STEAM-ENGINES.

Specification of Letters Patent No. 30,365, dated October 9, 1860.

To all whom it may concern:

Be it known that I, GEO. W'. VAN DEBEN, of Bigtlats, in the county ofChemung and State of New York, have invented a new and Improved Valvefor SteamEngines; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, forming part of this specification, in which-Figure l represents a transverse vertical section of my valve in itsapplication to a steam cylinder. Fig. Q shows a similar section of thesame applied to a steam cylinder in a diiferent manner from Fig. l. Fig.3 is a side elevation of my valve.

Similar letters of reference in the three views indicate correspondingparts.

The obj ect of this invention is to construct an oscillating steam valvein which the pressure of the steam has little or no effect to increasethe friction of the valve so that the same works with equal facilitywhen under pressure as it does before the steam is let on.

To enable those skilled in the art to fully vunderstand and use myinvention, I will proceed to describe its construction and operationwith reference to the drawing.

My valve consists of a hollow tube A, with a projection B, from oneside, which is turned ott so as to form a portion of a circle describedfrom the center of the tube which at the same time forms the center ofoscillation of the valve. One end of the tube A, is open and it isturned down and fitted steam tight into a nipple secured into the sideof the case which incloses the valve as clearly shown in red outlines inFig. 3. A square shoulder a, on this end assists in making the jointperfectly tight. The other end of the tube A, is closed and turned downto form a stem C, which passes through a stuthng box in the side of thecase and to which the crank is attached, through which motion, isimparted to the valve.

The projection, B, forms, the seat of the valve and it is made to titsteam tight into the interior of the case which surrounds the valve. Apassage b, leading through this seat B, communicates with the interiorof the tube A, and through the same with the open atmosphere.

This valve may be applied to a stealn cylinder as shown in Fig. l, wherethe upper side of the cylinder is represented in red outlines. Thechannels al, d, lead to both ends of the cylinder and the steam isadmitted to the outside of the valve. In the position in which the valveis shown in Fig. l, the steam passes into the cylinder through thechannel and it exhausts through the channel d, and through the interiorof the tube A.

Instead of using only one valve, two of my valves may be applied to thesame cylinder, and in this case the connection is made as shown in Fig.2, in red outlines. The steam is admitted to the cases which surroundthe valves through a pipe E, and in the position given to the valves inthat figure the steam passes into the cylinder through the channel CZ,and it exhausts through the channel d, and through the interior of thevalve over this channel. Both valves in this case may be connected tothe same eccentric or they may be operated by separate eccentrics orcams, if it is desired to work the steam expansively.

The construction of this valve is very simple, it is easily kept inorder and the pressure of the steam has little or no eifect on itsoperation.

Having thus fully described my invention what I claim as new and desireto secure by Letters Patent is.

The construction of the valve with a shoulder a at its extremity andwith a projection B extending beyond its periphery, and otherwise madeas herein shown and described for the purposes set forth.

GEQV. VAN DEBEN.

Witnesses HENRY M. HILEs, HENRY MINIER.

